Andy Murray is a welcome addition to Britain's Davis Cup team but there is no guarantee the former world number one will play in the singles, team captain Leon Smith has said.

No guarantees for Andy Murray at Davis Cup: Leon Smith

Gordon Murray, the father of Andy and Jamie Murray's father Willie, died last week

Murray to miss grandfather's funeral to play Davis Cup semi-final

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No guarantees for Andy Murray at Davis Cup: Leon Smith

Murray to miss grandfather's funeral to play Davis Cup semi-final